/* styles.css — Mental Model Craft */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg, #f7f2e7);
  color: var(--ink, #1c1814);
  font-family: var(--font-body, 'Geist', ui-sans-serif, system-ui, sans-serif);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mmdb {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
}

em { font-family: var(--font-accent); font-style: italic; font-weight: 400; letter-spacing: -0.005em; }

/* ───── Top bar ───── */
.topbar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 40px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--accent);
}
.brand-name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  margin-top: 2px;
}
.topbar-actions { display: flex; gap: 8px; }

/* ───── Hero ───── */
.hero {
  max-width: 980px;
  margin: 0 auto;
  padding: 72px 40px 32px;
  text-align: center;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(40px, 5.4vw, 68px);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
  color: var(--ink);
}
.hero-title em {
  color: var(--ink-2);
  font-size: 1.02em;
}
.hero-lede {
  max-width: 580px;
  margin: 0 auto 40px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-2);
  text-wrap: pretty;
}

/* ───── Search ───── */
.search-wrap {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
}
.search-icon {
  position: absolute;
  left: 18px;
  color: var(--ink-3);
  display: flex;
  pointer-events: none;
}
.search-input {
  width: 100%;
  height: 56px;
  padding: 0 110px 0 50px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.search-input:focus {
  border-color: var(--ink-2);
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--accent) 12%, transparent);
}
.search-input::placeholder { color: var(--ink-3); }
.search-clear {
  position: absolute;
  right: 90px;
  width: 26px; height: 26px;
  border: 0;
  background: transparent;
  color: var(--ink-3);
  border-radius: 6px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.search-clear:hover { background: color-mix(in oklch, var(--ink) 6%, transparent); color: var(--ink); }
.search-count {
  position: absolute;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

/* ───── Filters ───── */
.filters {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 40px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.filter-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
  align-items: baseline;
}
.filter-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  padding-top: 6px;
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.chip {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-2);
  padding: 5px 12px;
  border-radius: 999px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: background .12s, color .12s, border-color .12s;
}
.chip:hover { color: var(--ink); border-color: var(--ink-3); }
.chip-active {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}
.chip-active:hover { color: var(--surface); border-color: var(--ink); }
.chip-small { font-size: 11.5px; padding: 3px 9px; }

/* ───── Grid ───── */
.grid-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 40px 80px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
@media (max-width: 1080px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 720px)  { .grid { grid-template-columns: 1fr; } }

[data-density="compact"] .grid { gap: 1px; }
[data-density="roomy"]   .grid { gap: 1px; }

/* ───── Card ───── */
.card {
  background: var(--surface);
  padding: 22px 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  transition: background .14s;
  min-height: 220px;
  position: relative;
}
.card:hover { background: color-mix(in oklch, var(--accent) 4%, var(--surface)); }
[data-density="compact"] .card { padding: 16px 18px 14px; min-height: 180px; gap: 8px; }
[data-density="roomy"]   .card { padding: 28px 28px 24px; min-height: 260px; gap: 16px; }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.discipline-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.compare-btn {
  appearance: none;
  width: 24px; height: 24px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-3);
  border-radius: 6px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all .12s;
}
.compare-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.compare-btn.selected {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}

.card-title {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: -0.018em;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}
[data-density="compact"] .card-title { font-size: 18px; }
[data-density="roomy"]   .card-title { font-size: 25px; }

.card-summary {
  flex: 1;
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-2);
  text-wrap: pretty;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
[data-density="roomy"] .card-summary { -webkit-line-clamp: 4; font-size: 15px; }

.card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.usecase-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.usecase-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: color-mix(in oklch, var(--ink) 5%, transparent);
  color: var(--ink-2);
  border: 1px solid transparent;
  white-space: nowrap;
}
.note-dot {
  color: var(--accent);
  font-size: 9px;
  line-height: 1;
}
.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.example-count {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ───── Examples list (drawer + compare) ───── */
.examples-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.example-item {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0 14px 0;
  border-top: 1px solid var(--border);
}
.example-item:first-child { border-top: none; padding-top: 4px; }
.example-domain {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 4px;
}
.example-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  text-wrap: pretty;
}
@media (max-width: 560px) {
  .example-item { grid-template-columns: 1fr; gap: 4px; }
}

/* ───── Buttons ───── */
.ghost-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  padding: 8px 14px;
  border-radius: 10px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all .12s;
}
.ghost-btn:hover:not(:disabled) {
  border-color: var(--ink-3);
}
.ghost-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.ghost-btn.primary {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}
.ghost-btn.primary:hover:not(:disabled) {
  background: var(--ink-2);
}
.ghost-btn.small { padding: 6px 10px; font-size: 12px; }
.icon-btn {
  appearance: none;
  width: 30px; height: 30px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-2);
  border-radius: 8px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all .12s;
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-3); }

/* ───── Empty state ───── */
.empty {
  padding: 80px 40px;
  text-align: center;
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.empty-mark {
  font-family: var(--font-accent);
  font-size: 64px;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.empty h3 { margin: 0 0 6px; font-size: 20px; font-weight: 500; color: var(--ink); }
.empty p { margin: 0 0 20px; }

/* ───── Drawer ───── */
.drawer-scrim {
  position: fixed;
  inset: 0;
  background: color-mix(in oklch, var(--ink) 30%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
  z-index: 40;
}
.drawer-scrim.open {
  opacity: 1;
  pointer-events: auto;
}
.drawer {
  position: fixed;
  top: 0; right: 0;
  width: min(640px, 92vw);
  height: 100vh;
  background: var(--surface);
  border-left: 1px solid var(--border);
  transform: translateX(100%);
  transition: transform .3s cubic-bezier(.32,.72,0,1);
  z-index: 50;
  overflow-y: auto;
}
.drawer.open { transform: translateX(0); }
.drawer-inner { padding: 28px 40px 60px; }

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 12px;
}
.drawer-head-actions { display: flex; gap: 8px; }

.drawer-title {
  font-size: 38px;
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 0 0 18px;
  color: var(--ink);
  text-wrap: balance;
}

.drawer-usecases {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 32px;
}

.drawer-section {
  margin-bottom: 28px;
}
.drawer-section-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 10px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.drawer-section-hint {
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--ink-3);
}
.drawer-body {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  text-wrap: pretty;
}
.drawer-body.example {
  color: var(--ink-2);
  padding-left: 14px;
  border-left: 2px solid var(--border);
}

.related-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.related-chip {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink);
  padding: 6px 12px;
  border-radius: 999px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all .12s;
}
.related-chip:hover { background: var(--bg); border-color: var(--ink-3); }
.related-chip svg { color: var(--ink-3); }

.notes-area {
  width: 100%;
  min-height: 110px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font: inherit;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink);
  resize: vertical;
  outline: none;
  font-family: var(--font-body);
}
.notes-area:focus {
  border-color: var(--ink-3);
  background: var(--surface);
}
.notes-area.small { min-height: 80px; font-size: 13px; }

/* ───── Compare bar ───── */
.compare-bar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) scale(var(--dc-inv-zoom,1));
  transform-origin: bottom center;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--ink);
  color: var(--surface);
  padding: 10px 12px 10px 18px;
  border-radius: 14px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.18);
  z-index: 30;
  max-width: calc(100vw - 32px);
}
.compare-bar-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.75;
  flex-shrink: 0;
}
.compare-bar-count {
  display: none; /* hidden on desktop, shown on mobile */
}
.compare-bar-items {
  display: flex;
  gap: 6px;
  align-items: center;
  min-width: 0;
  flex: 1 1 auto;
}
.compare-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: color-mix(in oklch, var(--surface) 16%, var(--ink));
  border-radius: 999px;
  padding: 5px 4px 5px 12px;
  font-size: 13px;
  max-width: 220px;
  min-width: 0;
}
.compare-pill span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.compare-pill-x {
  appearance: none;
  border: 0;
  background: transparent;
  color: color-mix(in oklch, var(--surface) 70%, transparent);
  width: 18px; height: 18px;
  border-radius: 999px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.compare-pill-x:hover { background: color-mix(in oklch, var(--surface) 20%, var(--ink)); color: var(--surface); }
.compare-bar-hint {
  font-size: 12px;
  color: color-mix(in oklch, var(--surface) 60%, transparent);
  padding: 0 6px;
  white-space: nowrap;
}
.compare-bar-actions { display: flex; gap: 6px; flex-shrink: 0; }
.compare-bar .ghost-btn {
  background: transparent;
  border-color: color-mix(in oklch, var(--surface) 20%, transparent);
  color: var(--surface);
}
.compare-bar .ghost-btn:hover:not(:disabled) {
  border-color: color-mix(in oklch, var(--surface) 50%, transparent);
}
.compare-bar .ghost-btn.primary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--surface);
}
.compare-bar-cta-short { display: none; }

/* Mobile compare bar: stack into two clean rows */
@media (max-width: 640px) {
  .compare-bar {
    flex-wrap: wrap;
    width: calc(100vw - 24px);
    max-width: 420px;
    bottom: 12px;
    padding: 10px 10px 10px 14px;
    gap: 8px;
    row-gap: 10px;
  }
  .compare-bar-text { display: none; }
  .compare-bar-count {
    display: inline;
    font-size: 11px;
    background: color-mix(in oklch, var(--surface) 18%, var(--ink));
    color: var(--surface);
    padding: 2px 7px;
    border-radius: 999px;
    opacity: 1;
    letter-spacing: 0;
  }
  .compare-bar-items {
    flex: 1 1 100%;
    order: 1;
    width: 100%;
    flex-wrap: wrap;
  }
  .compare-pill {
    flex: 1 1 0;
    max-width: none;
    min-width: 0;
  }
  .compare-bar-actions {
    flex: 1 1 100%;
    order: 2;
    justify-content: space-between;
  }
  .compare-bar-actions .ghost-btn { flex: 1 1 0; justify-content: center; }
  .compare-bar-cta-long { display: none; }
  .compare-bar-cta-short { display: inline; }
}

/* ───── Compare overlay ───── */
.compare-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 60;
  overflow-y: auto;
  padding: 24px 40px 80px;
  animation: fadeIn .25s ease;
  /* flex column lets us reorder children across breakpoints */
  display: flex;
  flex-direction: column;
}
.compare-overlay > .compare-head   { order: 1; }
.compare-overlay > .compare-tabs   { order: 2; }
.compare-overlay > .compare-shared { order: 4; }  /* below grid on desktop */
.compare-overlay > .compare-grid   { order: 3; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.compare-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto 24px;
}
.compare-head-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Mobile-only A/B tabs */
.compare-tabs {
  display: none;
  max-width: 1280px;
  margin: 0 auto 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  gap: 4px;
}
.compare-tab {
  appearance: none;
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: 0;
  padding: 10px 12px;
  border-radius: 8px;
  font: inherit;
  color: var(--ink-2);
  cursor: pointer;
  text-align: left;
  transition: background .15s, color .15s;
}
.compare-tab:hover { color: var(--ink); }
.compare-tab.active {
  background: var(--ink);
  color: var(--surface);
}
.compare-tab-key {
  font-family: var(--font-mono);
  font-size: 11px;
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid currentColor;
  border-radius: 6px;
  opacity: 0.7;
  flex-shrink: 0;
}
.compare-tab.active .compare-tab-key { opacity: 0.85; }
.compare-tab-name {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.005em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  flex: 1 1 auto;
}

.compare-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 48px;
}
.compare-col-wrap { min-width: 0; }
.compare-divider {
  background: var(--border);
}
.compare-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.compare-col-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.compare-col-letter {
  display: none; /* desktop: hide letter — columns are obviously side-by-side */
  font-family: var(--font-mono);
  font-size: 11px;
  width: 22px; height: 22px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--ink-3);
}
.compare-col-title {
  font-size: 34px;
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.022em;
  margin: 4px 0 0;
  color: var(--ink);
  text-wrap: balance;
}
.compare-section { margin-top: 12px; }

.compare-shared {
  max-width: 1280px;
  margin: 56px auto 0;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.compare-shared-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.compare-shared-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 8px 0;
}
.compare-shared-key {
  font-size: 13px;
  color: var(--ink-2);
}

/* Mobile compare overlay: tabs + single column + In common at top */
@media (max-width: 880px) {
  .compare-overlay { padding: 16px 16px 100px; }
  .compare-head { margin-bottom: 16px; }
  .compare-tabs { display: flex; }
  .compare-overlay > .compare-shared { order: 3; }  /* above grid on mobile */
  .compare-overlay > .compare-grid   { order: 4; }
  .compare-grid { grid-template-columns: 1fr; gap: 0; }
  .compare-divider { display: none; }
  .compare-col-wrap.mobile-hidden { display: none; }
  .compare-col-letter { display: inline-flex; }
  .compare-col-title { font-size: 28px; }
  .compare-shared {
    margin: 0 auto 20px;
    padding: 16px 18px;
  }
  .compare-shared-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 6px 0;
  }
}

/* ───── Footer ───── */
.footer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px 48px;
}
.footer-rule {
  height: 1px;
  background: var(--border);
  margin-bottom: 24px;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
}
.footer-attrib {
  margin-top: 10px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--ink-2);
}
.footer-attrib span:first-child { font-style: italic; font-family: var(--font-accent); font-size: 15px; }
.footer-link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: border-color .15s, color .15s;
}
.footer-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

@media (max-width: 640px) {
  .footer-row { flex-direction: column; gap: 6px; }
  .footer-attrib { gap: 4px; }
}

/* ───── Scrollbar polish ───── */
.drawer::-webkit-scrollbar { width: 10px; }
.drawer::-webkit-scrollbar-track { background: transparent; }
.drawer::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
  border: 3px solid var(--surface);
  background-clip: content-box;
}